Add VMA naming fallback for LowLevelAlloc.

PiperOrigin-RevId: 911021583
Change-Id: I3fc632b8b142cc738ced0dbb40d5eef87cc30cf4

absl/base/internal/low_level_alloc.cc

diff --git a/absl/base/internal/low_level_alloc.cc b/absl/base/internal/low_level_alloc.cc
index a5bd71d..3887a92 100644
--- a/absl/base/internal/low_level_alloc.cc
+++ b/absl/base/internal/low_level_alloc.cc
@@ -47,6 +47,12 @@
 
 #ifdef __linux__
 #include <sys/prctl.h>
+#ifndef PR_SET_VMA
+#define PR_SET_VMA 0x53564d41
+#endif
+#ifndef PR_SET_VMA_ANON_NAME
+#define PR_SET_VMA_ANON_NAME 0
+#endif
 #endif
 
 #include <string.h>